A small or obscure place, especially such a restaurant(noun)
An automated teller machine (ATM)(noun)
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Use "hole-in-the-wall" in a sentence
"Imagine the thrill, then, to find a series of well preserved Mexican-made lobby cards of young Flynn in The Son of Captain Blood (El Hijo del Capitán Sangre) in a small (almost hole-in-the-wall) secondhand bookstore in Mexico City - which is what your humble correspondent did quite recently and yes (in case it hadn't occurred to you), your humble correspondent is a Sean Flynn fan."
"At the local hole-in-the-wall pharmacy, you don't know how long it's been on the shelf, if it was handled and stored properly, or if it's not a worthless imitation."
"Whenever I have moved to a different area of Los Angeles, or to a new city even, it's not the new Top Chef-helmed gourmet restaurants that I miss the most, but the local dive bars and hole-in-the-wall restaurants."